- typeof() is not a function
- formatting of && and || at the end of the line
- declaring variables more locally using let in Utils.extend
- the Initial Developer is the Mozilla Foundation
- removed new tab group (you may have to clear storage to get rid of your locked New Tabs group at the bottom of your screen)
- rm various special casing for the new tab group
- new tab experience for tabs-off-of-orphaned-tabs is implemented: they magically turn into a group, and it even snaps!
- broken: new tabs made with no active context
- broken: closing the last tab in a group: should go back to tab candy view
- broken: first run experience grouping of orphaned tabs
